Home / 20,739.47-31,109.22-5,157.09

Finding the Fourth Proportional to 20,739.47, 31,109.22 and 5,157.09

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Solution

The fourth proportional to 20,739.47, 31,109.22 and 5,157.09 is: 7,735.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.47 : 31,109.22 = 5,157.09 : x
  2. Step 2: Convert to fraction form
    20,739.47/31,109.22 = 5,157.09/x
  3. Step 3: Cross multiply
    20,739.47x = 31,109.22 × 5,157.09
  4. Step 4: Simplify right side
    20,739.47x = 160,433,047.37
  5. Step 5: Solve for x
    x = 160,433,047.37/20,739.47
  6. Step 6: Final answer
    x = 7,735.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.